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Updated: Jan 20, 2026
Transition Metals: Electron Configurations and Properties
Synthesis of a 6-nm-Long Transition-Metal-Rare-Earth-Containing Polyoxometalate
Qing Han1, Zhong Li2, Xiangming Liang1
1State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, and College of Chemistry and Chemical Engineering , Lanzhou University , Lanzhou 730000 , China.
Abstract:
An extremely long ribbon-shaped polyoxometalate (POM) octamer, {Eu16Co7Se16W128O448(CIT)10(HCIT)2(NO3)4(OH)4(H2O)52} (H4CIT = citric acid), with a maximum length of ca. 6 nm has been obtained, which is the longest molecular POM reported to date and the first Dawson-based 3d-4f-containing selenotungstate(IV). The nanoscale octamer is built from 8 new Dawson-type Eu2W2-substituted selenotungstates {(Eu2W2O4)Se2W14O52} bridged by 12 H4CIT ligands and 3 Co2+ ions, giving rise to a rare giant inorganic-organic hybrid molecular POM with more than 150 metal centers (7 CoII, 16 EuIII, 16 SeIV, and 128 WVI). Especially, with 128 W centers and more than 800 non-H atoms, the POM octamer also represents the largest known 3d-4f-containing polyoxotungstate.
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